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1 andidate Name entre Number 2 andidate Number GE AS/A level 1092/01 EMISTRY 2 A.M. MONDAY, 7 June hours FOR EXAMINER S USE ONLY Section Question Mark A 1-6 B ADDITIONAL MATERIALS TOTAL MARK In addition to this examination paper, you will need a: calculator; Data Sheet containing a Periodic Table supplied by WJE. Refer to it for any relative atomic masses you require INSTRUTIONS TO ANDIDATES Write your name, centre number and candidate number in the spaces at the top of this page. Section A Answer all questions in the spaces provided. Section B Answer all questions in the spaces provided. andidates are advised to allocate their time appropriately between Section A (10 marks) and Section B (70 marks). INFORMATION FOR ANDIDATES The number of marks is given in brackets at the end of each question or part-question. The maximum mark for this paper is 80. Your answers must be relevant and must make full use of the information given to be awarded full marks for a question. You are reminded that marking will take into account the Quality of Written ommunication used in all written answers. Page 14 may be used for rough work. J*(S )
2 2 SETION A Answer all questions in the spaces provided. 1. The covalent compound difluorine oxide has the formula F O F (i) Showing outer electrons, draw a dot and cross diagram for difluorine oxide. [1] Difluorine oxide reacts with magnesium metal to produce magnesium oxide and magnesium fluoride, MgF 2. Give the equation for this reaction. [1] 2. Potassium chloride can be used by those who need a low-salt diet. Its solubility in water at two temperatures is shown in the table. Temperature/ Solubility/ g per 100 g of water alculate the mass of solid potassium chloride produced when a saturated solution containing 500g of water is cooled from 100 to 15. [2]... g
3 3 3. The formula for an attraction pheromone for the pink bollworm is shown below. O 3 ( 2 ) ( 2 ) 5 O 3 (i) State a suitable catalyst for the hydrogenation of the bonds present. [1] This pheromone molecule contains two bonds which both have the Z (cis) configuration. Explain why an alkene can exist as either an E (trans) or a Z (cis) isomer. [1] 4. The relative molecular mass of a branched-chain alkane is 72. Alkanes have the general formula n 2n (i) State the molecular formula of the alkane.... [1] Draw one displayed formula of this alkane. [1] 5. Use the words increases or decreases to complete the sentence below. [1] Each word can be used once, more than once or not at all. As the hydrocarbon chain length in carboxylic acids increases, the boiling temperature... and the solubility in water State the type of reaction occurring during this chemical change. [1] + 2 O O... Total Section A [10] Turn over.
4 4 SETION B Answer all questions in the spaces provided. 7. (a) Sulfur hexafluoride, SF 6, is a colourless gas that is used as an insulator in electrical transformers. (i) omplete the table below, giving the number of bonding and lone pairs for the sulfur atom in a molecule of gaseous sulfur hexafluoride. $ Use your answers to deduce an F S F angle and name the shape of the SF 6 molecule. [4] Number of bonding pairs Number of lone pairs $ F S F Shape The S F bond in sulfur hexafluoride is a polar covalent bond. Describe what is meant by bond polarity and how it arises in this bond. [2] (iii) Sulfur hexafluoride reacts with hydrogen sulfide in a redox reaction. SF S 6F + 4S omplete the table below, giving the oxidation states (numbers) of the sulfur atoms present and use these to explain how hydrogen sulfide is the reducing agent in this reaction. [2] Oxidation state of sulfur in SF 6 Oxidation state of sulfur in 2 S Oxidation state of sulfur in sulfur, S
5 5 (b) Sodium fluoride is a white, ionic solid that has the same crystal structure as sodium chloride. Give the formula of each ion present and its crystal co-ordination number. [2] Sodium ion... rystal co-ordination number... Fluoride ion... rystal co-ordination number... (c) Tetrafluoroethene, 2 F 4, can be polymerised to give poly(tetrafluoroethene), PTFE, in a similar way to the polymerisation of ethene. (i) omplete and balance the equation below, showing a repeating section of the structural formula of poly(tetrafluoroethene). [1] n F F F F A stretched form of PTFE is marketed under the name Goretex. This is used to make waterproof materials that can breathe. Gaseous water molecules can escape from tiny holes in the fabric but larger liquid water droplets cannot enter. These liquid water droplets contain water molecules that are hydrogen bonded to each other. Draw a diagram to show hydrogen bonding between water molecules. [3] Total [14] Turn over.
6 6 8. (a) (i) g of impure calcium metal was added to water. ydrogen gas and calcium hydroxide were formed. Give the equation for this reaction. [1] All the hydrogen produced was collected and gave a volume of 64.0 cm Volume of hydrogen /cm Mass of pure calcium/ g Use the graph to find the mass of pure calcium present and hence the percentage purity of the calcium used. [2] (iii) Jonathan added a piece of strontium metal to water. e noticed that the reaction was more vigorous than when using calcium. e said that one reason for this was that the strontium ion, Sr 2+, was formed more easily than the calcium ion, a 2+. Explain why this statement is true, in terms of the electronic structures of the two metals. [2]
7 7 (b) A solution, giving an apple-green colour to a flame, was suspected to be aqueous barium hydroxide. Describe two simple tests to confirm this conclusion, giving the result of each test. [2] (c) Both solid strontium metal and solid graphite are conductors of electricity. Describe the structures of these two materials and explain how they are both able to conduct electricity. You may use diagrams in your answer. [5] QW [1] Strontium Graphite (d) There is much interest in carbon nanotubes as drug delivery agents. Describe how the structure of carbon nanotubes is related to the structure of graphite. [2] Total [15] Turn over.
8 8 9. (a) Methane reacts with gaseous chlorine giving chloromethane and hydrogen chloride. 4 (g) + l 2 (g) 3 l(g) + l(g) In a report of this reaction, a student came across a number of terms. Illustrating your answer with an equation in each case, state what is meant by (i) homolytic fission, [2] a propagation stage. [2] (b) Ethane reacts with chlorine in a similar way to methane. One of the products is 1,1,1-trichloroethane. l l l (i) The manufacture and use of 1,1,1-trichloroethane is now restricted because of its adverse effects on the ozone layer. owever, the corresponding fluoro-compound 1,1,1-trifluoroethane does not cause environmental problems in the ozone layer. Explain why the chloro-compound has these adverse effects. [2]
9 9 A sample of 1,1,1-trichloroethane is reacted with an excess of sodium hydroxide solution and then acidified. I. One of the organic products of this reaction is liquid R, whose mass spectrum shows a molecular ion at m/z 60. The infrared spectrum of R shows characteristic absorption frequencies at 1725cm 1 and cm 1. Use this information, showing your working, to suggest a structural formula for liquid R. [4] II. hloride ions are also produced when 1,1,1-trichloroethane reacts with aqueous sodium hydroxide. The products of the reaction are then acidified with nitric acid and the mixture tested for the presence of chloride ions. State the reagent(s) used and the observations when the mixture was tested for chloride ions. [2] Reagent(s)... Observations... Total [12] Turn over.
10 (a) Bromine is produced commercially from bromide ions in sea water by reaction with chlorine. (i) Give the equation for this reaction. [1] Although both bromine and chlorine are oxidising agents, this reaction proceeds because chlorine is a stronger oxidising agent than bromine. I. Explain what is meant by the term oxidising agent. [1] II. Explain why chlorine is the stronger oxidising agent. [2] (iii) Air is then blown through the bromine-containing mixture to remove bromine as its vapour. Iodine can be produced in a similar way from the iodide ions present in sea water but it is more difficult to produce iodine vapour from its solution because iodine is less volatile than bromine. Explain, in terms of bonding, why iodine is less volatile than bromine. [2] (b) One important use of a bromine compound is as a very concentrated aqueous solution of calcium bromide, in the oil industry. (i) The concentration of a calcium bromide solution is 1200gdm 3. alculate the concentration of this solution in mol dm 3. [2] Many of the metals present in compounds of Group 2 can be identified by a flame test. omplete the table below showing the flame colours (if any) obtained using magnesium bromide and calcium bromide. [2] ompound Flame colour (if any) magnesium bromide calcium bromide
11 11 (c) 1,2-Dibromo-3-chloropropane has been used to control nematode worm attack on fruit and vegetables. (i) Give the displayed formula of this compound. [1] It can be made by reacting 3-chloropropene with bromine. l 3-chloropropene I. State why this is described as an addition reaction. [1] II. Bromine reacts as an electrophile in this reaction. Give the formula of another example of an electrophile. [1]... III. The mechanism for this reaction can be shown using a curly arrow ( ). State what this symbol is used to represent. [1] Total [14] Turn over.
12 (a) One method for making butan-1-ol is to react sodium hydroxide (used as a source of hydroxide ions) and 1-chlorobutane. Describe how butan-1-ol can be made in this way. Your answer should state any necessary conditions show the mechanism for the reaction between hydroxide ions and 1-chlorobutane state the type of reaction mechanism [6] (QW) [2] (b) ompound G is an isomer of butan-l-ol and its skeletal formula is O (i) Give the systematic name of compound G. [1] ompound G, 4 10 O, is being developed as a possible replacement for ethanol in fuels. In a new process it is made by reacting genetically modified E. coli bacteria with glucose in aqueous solution. One equation for this is 6 12 O O + 2O O M r 74 In a laboratory experiment, 0.50 mol of glucose reacted in this way to give an 86% yield, by mass, of compound G. alculate the mass of compound G produced. [2]
13 13 (iii) Both butan-1-ol and compound G are primary alcohols that can be oxidised to carboxylic acids. Give an oxidising agent that can be used, in acid solution, to oxidise primary alcohols to carboxylic acids and state what is seen as the reaction proceeds. [2] Oxidising agent... Observation(s)... (c) One method of preparing an alcohol is from an alkene and water/steam. State the conditions of temperature and pressure used in the preparation of ethanol from ethene. [2] Temperature... Pressure... Total [15] Total Section B [70]
14 14 Rough Work
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